The Ashikaga era is a part of Japanese history.

The Asuka Period is a part of Japanese history, a time when culture and arts greatly developed.

The Muromachi period is a part of Japanese history, a time when many cultural changes occurred.

The Kamakura period was a very important time in Japanese history.

The government declared a state of emergency to prevent the spread of the new coronavirus.

He is good at playing the guqin.

I am learning Old English.

This antique clock is a keepsake from my grandfather.

This old document is very important for understanding our history.

Archaebacteria are one of the oldest life forms on Earth.